\begin{table}[!htbp] \centering
\caption{Mean comparison municipalities in/out of sample (with/without Francoist street names in June 2016)}
\label{tab:ttest_sample}
\small
\begin{tabular}{lcccc}
\\[-1.8ex]\hline
\hline \\[-1.8ex]
\\[-1.8ex]
Party & In sample & Out of sample & Diff & P-value \\
\hline \\[-1.8ex]
& \multicolumn{4}{c}{April 2019}\\
PP & 26.72\% & 23.95\% & 2.77 & 0.000*** \\
PSOE & 31.72\% & 28.04\% & 3.68 & 0.000*** \\
VOX & 12.31\% & 9.33\% & 2.97 & 0.000*** \\
\hline \\[-1.8ex]
& \multicolumn{4}{c}{June 2016}\\
PP & 44.42\% & 38.49\% & 5.94 & 0.000*** \\
PSOE & 27.21\% & 23.13\% & 4.08 & 0.000*** \\
VOX & 0.21\% & 0.2\% & 0.01 & 0.650 \\
\hline \\[-1.8ex]
& \multicolumn{4}{c}{December 2015}\\
PP & 40.34\% & 35.26\% & 5.08 & 0.000*** \\
PSOE & 27.86\% & 23.26\% & 4.6 & 0.000*** \\
VOX & 0.23\% & 0.22\% & 0 & 0.796 \\
\hline \\[-1.8ex]
& \multicolumn{4}{c}{November 2011}\\
PP & 54.87\% & 47.07\% & 7.8 & 0.000*** \\
PSOE & 31.23\% & 28.01\% & 3.23 & 0.000*** \\
\hline
\hline \\[-1.8ex]
\multicolumn{5}{c}{\parbox[t]{0.65\textwidth}{\textit{Note:} * $p<0.05$; ** $p<0.01$; *** $p<0.001$.}}\\
\end{tabular}
\end{table}
